] This chapter investigates America's two-party system and
] its role in American politics. It traces the historical
] development of political parties in the United States,
] examining the role of minor parties and the reasons for
] the emergence and persistence of the two-party system.
] The chapter also discussed the effects of this system on
] policy and coalition formulation.

Here's a one-page description of America's two-party system. Or, if you think you already know this stuff, click on "Multiple Choice Quiz" on the lefthand side of the page, and prove it. :)

Online Learning: Political Parties, Candidates, and Campaigns